Worksheet: Applications of Electromagnetic Waves

In this worksheet, we will practice describing the uses of different types of electromagnetic radiation in a variety of applications and technologies.

Q1:

Which of the following would be a typical application of ultraviolet radiation?

  • AHeating objects
  • BProducing fluorescence
  • CImaging the interiors of objects
  • DTransmitting signals through fiber cables

Q2:

Which of the following statements does not correctly explain why infrared radiation is more useful than visible light when searching for survivors of accidents where buildings collapse with people inside them?

  • AInfrared radiation is transmitted through solid objects much better than visible light is.
  • BInfrared radiation from the breath of the people trapped can be detected, and this can help in locating them.
  • CInfrared radiation can be detected in darkness as easily as in well-lit conditions.
  • DInfrared radiation emitted by living things because of their temperature makes it easier to tell them apart from their lower temperature surroundings.

Q3:

Which of the following statements correctly explains why microwave ovens strongly heat food inside them but do not strongly heat the glass plates that the food rests on?

  • AMicrowaves are more strongly absorbed by water molecules than by molecules in glass.
  • BGlass emits microwaves more easily than it absorbs them.
  • CFood has a higher density than glass so it absorbs more microwave energy.
  • DGlass reflects microwaves better than food does.

Q4:

Which of the following would be a typical application of gamma radiation?

  • AKilling cells and organisms
  • BTransmitting signals between Earth and space
  • CHeating objects
  • DProducing fluorescence

Q5:

Which of the following would be a typical application of X-ray radiation?

  • AHeating objects
  • BProducing fluorescence
  • CTransmitting signals between Earth and space
  • DImaging the interiors of objects

Q6:

Which of the following would be a typical application of visible radiation?

  • ABroadcasting signals over Earth through the atmosphere
  • BTransmitting signals through fiber cables
  • CTransmitting signals between Earth and space
  • DProducing fluorescence

Q7:

Which of the following would be a typical application of infrared radiation?

  • AImaging the interiors of objects
  • BHeating objects
  • CTransmitting signals between Earth and space
  • DProducing fluorescence

Q8:

Which of the following would be a typical application of microwaves?

  • AProducing fluorescence
  • BTransmitting signals between Earth and space
  • CImaging the interiors of objects
  • DTransmitting signals through fiber cables

Q9:

Which of the following would be a typical application of radio waves?

  • ABroadcasting signals over Earth through the atmosphere
  • BImaging the interiors of objects
  • CHeating objects
  • DProducing fluorescence

Q10:

One or more of the following statements correctly describe the difference between how food is cooked using infrared radiation and using microwaves, as shown in the diagram, where heating is shown by redder parts of the diagram. Which are the correct statements?